refac: authenticated user can edit an article's body; an unknown id returns 404

api/router.go

@@ -41,6 +41,7 @@ func NewArticleRouter(container *UseCases) http.Handler {
 		r.Get("/{id}", articleHandler.GetArticle)
 		r.Post("/", articleHandler.PostArticle)
 		r.Delete("/{id}", articleHandler.DeleteArticle)
+		r.Patch("/{id}", articleHandler.UpdateArticleBody)
 		r.Patch("/{id}/publish", articleHandler.PublishArticle)
 		r.Patch("/{id}/unpublish", articleHandler.UnpublishArticle)
 	})